Clock



FIG. 1 is a front elevational view of a clock showing my new design;

FIG. 2 is a right side elevational view thereof with a left side elevational view being a mirror image of FIG. 2;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof, and

FIG. 5 is a rear elevational view thereof on a reduced scale. 

The ornamental design for a clock, as shown and described. 